History of the Peloponnesian War

This was without doubt the largest army of Athenians ever assembled, the state being still in the flower of her strength and yet unvisited by the plague. Full ten thousand heavy infantry were in the field, all Athenian citizens, besides the three thousand before Potidaea. Then the resident aliens who joined in the incursion were at least three thousand strong; besides which there was a multitude of light troops. They ravaged the greater part of the territory, and then retired.